8-Hr vs 10-Hr Shift Model Comparison

AT A GLANCE

	8-HOUR SHIFTS	10-HOUR SHIFTS	NOTE
Shift times	0600–1400 / 1400–2200 / 2200–0600	0600–1600 / 1400–0000 / 2200–0800	10-hr shifts overlap by 2 hrs
Hours per shift	8 hrs	10 hrs
Shifts per week	5 shifts	4 shifts	Both = 40 hrs/wk
Days on / days off	5 on / 2 off (varies by rotation)	4 on / 3 off (every week)	3 consecutive days off in 10-hr
Shift handoff overlap	None — clean transition	2 hrs at each transition	Continuity vs efficiency
Gross hrs / yr	2,080 hrs	2,080 hrs	Identical
Annual leave (hrs)	160 hrs = 20 shift-days	160 hrs = 16 shift-days	Same hours, fewer "days"
Sick leave (hrs)	104 hrs	104 hrs	Identical
Holiday hrs / person	11 × 8 = 88 hrs	11 × 10 = 110 hrs	Holiday = scheduled workday length
Total mandatory leave	352 hrs/yr	374 hrs/yr	22 hrs more per person
Net available hrs/yr	1,728 hrs (83%)	1,706 hrs (82%)	Per person before buffer
FTE per position (25% buf)	7 FTE	7 FTE	Same result
Total headcount (25% buf)	28 people	28 people	Same result
Night diff hrs / day (operation)	EVE: 16 + NGT: 32 = 48 hrs	EVE: 24 + NGT: 32 = 56 hrs	10-hr EVE covers more night hours
Night diff hrs / year (operation)	48 × 365 = 17,520 hrs	56 × 365 = 20,440 hrs	+2,920 hrs/yr for 10-hr
Sunday premium hrs / year	12 × 8 × 52 = 4,992 hrs	12 × 10 × 52 = 6,240 hrs	+1,248 hrs/yr for 10-hr
Roster structure (2-week)	5 teams × 4 people = 20 active rotators + broader pool	7 teams × 4 people = 28 — all in rotation, buffer built in

HEADCOUNT — SAME RESULT AT SAME BUFFER

8-HOUR MODEL · 25% BUFFER

28

21 operators + 7 supervisors
7 FTE per position

10-HOUR MODEL · 25% BUFFER

28

21 operators + 7 supervisors
7 FTE per position

Despite different shift structures, both models land at 28 dedicated rotators at a 25% contingency buffer (32 at 30%). The choice between models does not change how many people you need — it changes how those people are scheduled, how much premium pay you owe, and what quality of life looks like for your workforce.

PREMIUM PAY COST ESTIMATOR — 10-HR OVER 8-HR

BASE SALARY PER PERSON (ADJUST TO YOUR GS GRADE)

$80,000

$50k GS-11–GS-12 RANGE $150k

NIGHT DIFFERENTIAL (+10%)

8-hr model/yr$67,573

10-hr model/yr$78,769

+$11,196/yr

2,920 extra night-diff hrs/yr

SUNDAY PREMIUM (+25%)

8-hr model/yr$48,077

10-hr model/yr$60,096

+$12,019/yr

1,248 extra Sunday-premium hrs/yr

TOTAL PREMIUM DIFFERENCE

Total 8-hr premium/yr$115,650

Total 10-hr premium/yr$138,865

+$23,215/yr

above 8-hr baseline

ESTIMATED ANNUAL PREMIUM PAY DIFFERENCE (10-HR OVER 8-HR)

~1.5% of total base salary cost ($2.24M at $80k)

+$23,215

per year, 28-person operation

What this includes: Night differential (5 CFR 550.122) on extra hours the evening shift earns under a 10-hr schedule (1800–0000 vs 1800–2200), and Sunday premium (5 CFR 550.171) on the additional 2 hours of Sunday exposure per shift.

What this excludes: Locality pay multipliers, FEHB/FEDVIP benefits, TSP contributions, and retirement — those are identical between models and not affected by shift length. Holiday leave is already factored into the FTE math, not an incremental cash cost here.

OPERATIONAL TRADEOFFS

8-HOUR SHIFTS — ADVANTAGES

+ Lower premium pay (~2% less annually)

+ No handoff overlap — zero double-staffing cost at transitions

+ 160 hrs annual leave = 20 shift-days — psychologically more generous to employees

+ Standard workday aligns with traditional federal and contractor schedules

+ Broader pool model gives 8 people dual primary/backfill roles — more organizational flexibility

— Rotating off-days are irregular — harder to plan personal life

— No built-in overlap for situation handoff; continuity depends entirely on written logs

— Roster math requires a "broader pool" — may be harder to justify as pure shift positions

10-HOUR SHIFTS — ADVANTAGES

+ 3 consecutive days off every week — better recovery, fewer fatigue incidents

+ 2-hr handoff overlap builds in structured continuity at every shift change

+ Clean 7-day roster cycle — easier for supervisors to manage and explain

+ 25% buffer is structurally embedded in the rotation — all 28 people are active rotators

+ Likely better retention — predictable schedule quality reduces voluntary turnover

— ~2% more premium pay annually (night differential + Sunday premium)

— 160 hrs annual leave = only 16 shift-days — same hours but fewer "days off" feel

— Holidays cost 10 hrs each — slightly tighter effective availability per person

THE RETENTION WILDCARD

COST OF REPLACING ONE PERSON

Recruiting / advertising

Background investigation

Initial training (qualification)

Reduced productivity (ramp-up)

Estimated total: 50–150% of annual salary

BREAK-EVEN MATH

If the 10-hr schedule prevents even one voluntary departure per year from a 28-person team, the avoided replacement cost (~$40k–$120k) exceeds the entire annual premium pay difference (~$23k–$55k at typical GS salaries).

Schedule quality is the single largest driver of voluntary attrition in 24/7 operations. Three consecutive days off per week is consistently rated the most valued scheduling feature by shift workers.

The ~2% premium pay difference between models is real but small relative to the base salary cost. The retention advantage of the 10-hr model is harder to quantify but likely larger in practice. Organizations with high mission-critical qualification requirements — where losing a trained operator has outsized impact — should weight retention heavily in this decision.

8-HR vs 10-HR: MODEL COMPARISON